#pragma once

#include "Poller.h"
#include "Timestamp.h"

#include <vector>
#include <sys/epoll.h>

class Channel;
/*
*  epoll的使用
*  epoll_create
*  epoll_ctl      add/mod/del
*  epoll_wait
*/
class EPollPoller : public Poller
{
public:
    EPollPoller(EventLoop* loop);
    ~EPollPoller() override;

    // 重写基类Poller的抽象方法
    Timestamp poll(int timeoutMs,ChannelList* activeChannels) override;
    void updateChannel(Channel* channel) override;
    void removeChannel(Channel* channel) override;
private:
    static const int kInitEventListSize = 16; // 初始化数组的长度

    // 填写活跃的连接
    void fillActiveChannels(int numEvents,ChannelList *activeChannels) const;
    // 更新Channel通道
    void update(int operation,Channel* channel);

    using EventList = std::vector<epoll_event>;

    int epollfd_;
    EventList events_;
};